Grinding mill



Aug. 18, 1936. o. A. JOHNSON GRINDING MILL Filed Feb. 4, 1935 n NN NN NN.NN NN mw QJ@ NNN )NN N N.

ATTORNEYS Patented Aug. 18, 1936 UNITED STATES PATENT OFFICE GRINDINGMILL Oscar A. Johnson, Chattanooga, Tenn.

Application February 4, 1935, Serial No. 4,928

1 Claim.

This invention relates to grinding mills and its general object is toprovide a mill that is primarily designed for grinding diiferent kindsof grain simultaneously, or the same kind at differ- 5 ent degrees ofneness.

An important object of the inventionV is to provide a grinding mill thatincludes a stationary stone disposed between rotary stones, with thelatter adjustable with respect to the stationary stone and in a mannerwhereby the adjustment is semi-automatic.

A further object of the invention is to provide a grinding mill that canbe operated with minimum power, is easily adjustable, includes mini- 5mum working parts, is simple in construction,

inexpensive to manufacture and install, and extremely efficient inoperation and service.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure l is a longitudinal sectional View taken through the mill Vwhichforms the subject matter of the present invention with parts inelevation.

Figure 2 is a sectional view taken approximately on line 2-2 of Figure1, looking in the direction of the arrows.

Figure 3 is a perspective View of the stationary mill stone.

Referring to the drawing in detail, the reference numeral I indicatesthe housing of my mill which as shown is of cylindrical formation and ispreferably supported in elevated position with respect to a foundationas shown, through the instrumentality of blocks 2 having roundedrecesses in the upper surfaces thereof to follow the curvature of thehousing.

Secured to the top of the housing are twin hoppers 3 that have spouts 4extending into the housing in spaced parallel relation with respect toeach other, while extending at an inclination from their lower portionof the housing are outlet spouts 5, and the foundation in thearrangement as shown is provided with recesses to accommodate the outletspouts which of course communicate with the housing through the mediumof openings arranged therein, as best shown in Figure 2,

The form shown includes a stationary stone 6 of circular formation andwhich is provided with a plurality of threaded openings 'I about thecircumference thereof to receive screw bolts 8 that extend through thehousing and blocks 9 for securing the stationary stone in flxedrelation5 with respect to the housing as will be apparent.

The blocks 9 may be segments of an annular spacing element, but in anyevent space the stationary stone from the housing. The stationary stoneis secured midwayy between the sidewalls I0 of 10 the housing, and isprovided with recesses II, there being a recess upon the opposite sidesthereof and which are substantially wedge shape, with theirmouthportions uppermost and disposed directly below the spouts 4-ofthehoppers 3.'-The lower ends of the recesses merge into the outer sidefaces of the stone 6 adjacent to circularv recesses I2 arrangedcentrally in the opposite sides.

Secured to the foundation and upon opposite sides of the housing I areframes each of which include a pair of spaced uprights I3 and each pairof uprights are secured together by a cross member I4. The upper ends ofthe uprights have secured thereto bearing boxes I5 which receive rollerbearings I6, and extending through the bearing boxes and mounted in theroller bearings are shafts II, the latter extending into the housing Ithrough openings in the side walls thereof and have the rotary stones I8secured thereto. For that purpose the shafts I'I are each provided witha collar I9 that act as abutting means for the stones I8 which areprovided with bores extending centrally therethrough to receive theshaft I'I, and the latter have screw threaded inner ends for nuts thatare arranged within recesses 2| disposed in the inner faces of thestones I8 in a manner to be aligned with the recesses I2, so that thenuts 20 will be aligned accordingly.

Keyed to the shafts I 1 between the bearing boxes I5 are pulleys 22,there beingY a pulley for each shaft and secured thereto againstlongitudinal movement. The pulleys are of course to receive a belt forconnection with suitable power means for operating the mill.

In order to adjust the rotary stones with respect to the stationarystone, I employ Yadjusting means which include a bracket 23 for each ofthe frames and the bracket of each frame is formed on and rises from theouter upright thereof. Each bracket is provided with a head having athreaded bore arranged therein to threadedly receive a screw 24 having apointed inner end to be received in an indentation made in the outer endof its shaft, so that upon rotation of the screws 24 in one direction,the shafts will be moved inwardly. The screws are each provided with awheel 25 for actuating the same, and each screw is provided with lockingmeans in the form of a nut 26 having a handle secured thereto, so thatwhen the screws are adjusted, they are held in adjusted positionsthrough the instrumentality of the locking means.

Each shaft has surrounding the same coil springs 21 that are secured towear plates 28 or the like, having openings therein to receive the endsof the springs, and the outermost plates engage the pulleys which arekeyed to the shafts and the innermost plates engage the bearing boxes,as shown in Figure 1, with the result it will be seen that the coilsprings will act to hold the shafts against the screws 24 and when thelatter are moved outwardly the springs will move the shafts accordingly,therefore the adjustment for the stones I8 is semi-automatic and isbrought about by rotating the screws 24 through the instrumentality oftheir wheels 25.

The confronting faces of the stones 6 and I8 are preferably serrated asshown so as to provide grinding surfaces, and in the use of my mill, theWhole grain is disposed in either one or both of the hoppers 3 so as tobe received in the recesses Il. As the grain is ground, it will work itsway between the stones and thence be passed through the outlet spouts 5.

By employing a single stationary stone and a pair of rotary stonesarranged as shown, with the relative structure, it will be obvious thatgrains of different kinds can be ground simultaneously, and at differentdegrees of ineness. Of course, the same kind of grain can be groundaccordingly.

It is thought from the foregoing description that the advantages andnovel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the constructionand in the combination and arrangement of the several parts, providedthat such changes fall within the scope of the appended claim.

What I claim is:

In a grinding mill, a housing, inlet and outlet 1 means for saidhousing, a stationary stone having threaded openings extending thereinabout its circumference, spacing means for said stone, means passingthrough the spacing means and threaded in the openings for xing thestone l Within the housing in spaced relation thereto, said stone havinga wedge shaped recess extending from its upper end to adjacent itscenter and aligned with the inlet means, a rotary stone in said casing,said stones having serrated con- 2* fronting faces, a frame supportedlaterally of the housing, a shaft for the rotary stone and journaled inthe frame, screw means for moving the shaft longitudinally in adirection for urging the rotary stone toward the stationary stone,locking 25 means for the screw means, a pulley fixed to the shaft, Wearplates surrounding the shaft and having openings therein with one plateengaging the pulley and the other the frame, and a coil spring havingits end convolutions received in the open- 3( ings and adapted formoving the shaft longitudinally vin an opposite direction forcooperation With the screw means in adjusting the rotary stone withrespect to the stationary stone.

OSCAR A. JOHNSON.

